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How to find the 99 percent confidence interval for the population mean.

Describe A small town has a population of 20,000 people. Amongst these 1,000 regularly visit a popular local bar. An ex of 100 people who visit the bar is surveyed for their annual expenditures in the bar. It is originate that on average each person who regularly visits the bar spends about $1500 per year in the bar with a standard deviation of $120. Construct a 99 percent sureness interval around the mean annual expenditure in the bar

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